I also use { extensively (dyadic). I appreciate the challenge of
coming up with a minimal list. One criteria may be: can it be done
relatively easily with one of the other operations?
For {, it's fairly easy to use {. and }....
For example: {. 3 }. 0 1 2 3 4 5
With a trivial case, the performance is negligible, but perhaps not as readable
100 timespacex '{. 9999999 }. i. 1e7'
0.0248935 1.3422e8
100 timespacex '9999999 { i. 1e7'
0.0269468 1.3422e8
I mostly use it for simple indexing. I didn't understand your comment
about mixing +ve and -ve. Can you elaborate?
[by the way, excellent list Devon. I may use it to extend my
coffeescript implementation of APL to have functioning examples for
each of those operations]
On Tue, Sep 2, 2014 at 2:39 PM, Vijay Lulla <[email protected]> wrote:
> Just out of curiosity, why is { not included? I use it extensively for my J
> explorations. Also, it is much more regular and useful(flexible?) than
> indexing in other languages. For e.g., You cannot mix +ve and -ve indexes
> in R but it works as expected (at least for me) in J. Regardless, nice work.
>
> Thanks,
> Vijay.
>
>
> On Tue, Sep 2, 2014 at 1:16 PM, Devon McCormick <[email protected]> wrote:
>
>> Based on Skip's suggestion, this page is now here -
>> http://www.jsoftware.com/jwiki/DevonMcCormick/MinimalBeginningJ - and is
>> titled "Minimal J for Beginners".
>>
>>
>> On Tue, Sep 2, 2014 at 1:10 PM, Devon McCormick <[email protected]>
>> wrote:
>>
>> > Good point - I picked up the "J Kernel" label from the discussion.
>> >
>> >
>> > On Tue, Sep 2, 2014 at 12:36 PM, Skip Cave <[email protected]>
>> > wrote:
>> >
>> >> Devon, nice job of putting together a reduced set of primitives for rhe
>> >> beginner. The only issue I see is the name. As a beginner, I would never
>> >> think to find a set of most-commonly-used primitives under the name "J
>> >> Kernel" That actually sounds like a discussion of the internals of J,
>> >> which
>> >> is what I thought when I read the subject of your email. I doubt that a
>> >> beginner would check out a page with that label. A title like "J's Basic
>> >> Commands for Beginners" or equivalent, would be more likely to attract
>> the
>> >> intended audience.
>> >>
>> >> Skp
>> >>
>> >> Skip Cave
>> >> Cave Consulting LLC
>> >>
>> >>
>> >> On Tue, Sep 2, 2014 at 9:54 AM, Devon McCormick <[email protected]>
>> >> wrote:
>> >>
>> >> > Based on some feedback from Greg Borota last year on his experiences
>> >> > learning J, I've put together a page on the J Wiki -
>> >> > http://www.jsoftware.com/jwiki/DevonMcCormick/JKernel - that has a
>> few
>> >> > selected things from J on which a beginner can concentrate to avoid
>> >> being
>> >> > overwhelmed by the language in full.
>> >> >
>> >> > It's a pretty bare minimum and I couldn't find a good link that
>> explains
>> >> > J's use of single quote for quoted strings but everyone should feel
>> >> free to
>> >> > add to it - sparingly, as it's supposed to be a reduced set of the
>> >> > language.
>> >> >
>> >> > It might make sense to leave the existing page much as it is and to
>> >> think
>> >> > about a 2nd tier of slightly more advanced verbs and such. There were
>> >> good
>> >> > suggestions in the original discussion -
>> >> >
>> >> >
>> >>
>> http://jsoftware.2058.n7.nabble.com/Learning-J-language-initial-thoughts-td52786.html#a52793
>> >> > - that I elided as I consider them more than the bare minimum (things
>> >> like
>> >> > rank modifiers and logic verbs).
>> >> >
>> >> > --
>> >> > Devon McCormick, CFA
>> >> > ----------------------------------------------------------------------
>> >> > For information about J forums see
>> http://www.jsoftware.com/forums.htm
>> >> >
>> >> ----------------------------------------------------------------------
>> >> For information about J forums see http://www.jsoftware.com/forums.htm
>> >>
>> >
>> >
>> >
>> > --
>> > Devon McCormick, CFA
>> >
>> >
>>
>>
>> --
>> Devon McCormick, CFA
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
